Back cushion



FIG. 1 is a left side elevational view of a back cushion showing my newdesign, the right side being a mirror image of that shown;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top, front, and right side perspective view thereof, withthe flap shown in an opened condition.

The ornamental design for back cushion, as shown and described.